feat(richtext-lexical): more lenient MDX JSON object parser that allows unquoted property keys (#10205)

Previously, the following MDX could not be parsed by lexical:

```tsx
<RestExamples
  data={[
    {
      operation: "Find"
    }
]}
```

Instead, it had to be converted into valid JSON:

```tsx
<RestExamples
  data={[
    {
      "operation": "Find"
    }
]}
```

This PR permits using the first example, as it swaps out JSON.parse with
them ore lenient [json5](https://www.npmjs.com/package/json5) package
parser

Author: AlessioGr

eslint.config.js

@@ -19,6 +19,7 @@ export const defaultESLintIgnores = [
   '**/build/',
   '**/node_modules/',
   '**/temp/',
+  '**/*.spec.ts',
 ]
 
 /** @typedef {import('eslint').Linter.Config} Config */

packages/richtext-lexical/package.json

@@ -362,6 +362,7 @@
     "bson-objectid": "2.0.4",
     "dequal": "2.0.3",
     "escape-html": "1.0.3",
+    "json5": "^2.2.3",
     "lexical": "0.20.0",
     "mdast-util-from-markdown": "2.0.2",
     "mdast-util-mdx-jsx": "3.1.3",

packages/richtext-lexical/src/utilities/jsx/extractPropsFromJSXPropsString.ts

@@ -1,3 +1,7 @@
+import JSON5Import from 'json5'
+
+const JSON5 = ('default' in JSON5Import ? JSON5Import.default : JSON5Import) as typeof JSON5Import
+
 /**
  * Turns a JSX props string into an object.
  *
@@ -78,7 +82,7 @@ function handleArray(propsString: string, startIndex: number): { newIndex: numbe
     i++
   }
 
-  return { newIndex: i, value: JSON.parse(`[${value}]`) }
+  return { newIndex: i, value: JSON5.parse(`[${value}]`) }
 }
 
 function handleQuotedString(
@@ -116,10 +120,10 @@ function handleObject(propsString: string, startIndex: number): { newIndex: numb
 
 function parseObject(objString: string): Record<string, any> {
   if (objString[0] !== '{') {
-    return JSON.parse(objString)
+    return JSON5.parse(objString)
   }
 
-  const result = JSON.parse(objString.replace(/(\w+):/g, '"$1":'))
+  const result = JSON5.parse(objString.replace(/(\w+):/g, '"$1":'))
 
   return result
 }

packages/richtext-lexical/src/utilities/jsx/jsx.spec.ts

@@ -3,7 +3,11 @@ import { propsToJSXString } from './jsx.js'
 
 describe('jsx', () => {
   describe('prop string to object', () => {
-    const INPUT_AND_OUTPUT = [
+    const INPUT_AND_OUTPUT: {
+      input: string
+      inputFromOutput?: string
+      output: Record<string, any>
+    }[] = [
       {
         input: 'key="value"',
         output: {
@@ -112,6 +116,15 @@ describe('jsx', () => {
           update: true,
         },
       },
+      {
+        // Test if unquoted property keys in objects within arrays are supprted. This is
+        // supported through the more lenient json5 parser, instead of using JSON.parse()
+        input: 'key={[1, 2, { hello: "there" }]}',
+        inputFromOutput: 'key={[1, 2, { "hello": "there" }]}',
+        output: {
+          key: [1, 2, { hello: 'there' }],
+        },
+      },
     ]
 
     for (const { input, output } of INPUT_AND_OUTPUT) {